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Let callers override gRPC-code-to-zap-level mapping - #38
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Standard server's grpc_zap interceptor always maps codes.ResourceExhausted to Info with no way to override it, which is noisy for services doing admission control (e.g. substreams tier2 backpressure refusals). Callers can now supply their own code-to-level mapping via server.Options; default behavior (package Verbosity) is unchanged when unset.
maoueh
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Sep 29, 2026
Cuts Cloud Logging volume on substreams-workers: these two log lines accounted for ~37% of sampled bytes on every backpressure refusal. Refusal rate/reason stays visible via substreams_tier2_rejected_request_counter. Bumps dgrpc to pick up server.WithCodeLevelFunc (streamingfast/dgrpc#38) and uses it to demote ResourceExhausted on tier2's gRPC server while keeping its default code-to-level mapping for every other code.
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server.WithCodeLevelFunc(func(codes.Code) zapcore.Level)option, consumed bydgrpc/server/standard'snewGRPCServerin place of the built-indefaultServerCodeLevelwhen set.standard.Verbosity) unchanged for every existing caller; this is opt-in per server instance.codes.ResourceExhaustedat Info on every backpressure refusal — a high-QPS, expected condition for services doing admission control. With this option a caller can demote just that code (or remap the whole table) without dgrpc hardcoding a demotion for everyone.